Improved pulley-block



UNITED STATES PATENT OFFICE.

JOSEPH M. DRAKE, OF AMITYVILLE, NEW YORIC IMPROVED PULLEY-BLOCK.

To all whom, it may concern:

Be it known that I, JOSEPH M. DRAKE, of Amityville, in the county ofSuffolk and State ot' New York, have invented a new and usei'ulImprovement in Pulley-Blocks; and I do hereby declare that the followingis a full, clear, and exact description of the same, reference bein ghad to the accompanying drawings, making a part of this specification,in which- Figure 1 is a section of my invention, taken in thel line xFig. 2; Fig. 2, a section ofthe same, taken in the line y y, Fig. 1.

Similar letters of reference indicate corresjonding parts in the twoligurcs.

To enable those skilled in the artto fully understand and construct myin vention, l will proceed to describe it.

A represents the block in which the pulley or wheel B is placed. Thisblock may be constructed ot' wood in the usual or in any proper manner.rlhe pulley or wheel B may he either` of wood or metal-in the drawingsit is represented as being ofinetal-and it has a grooved periphery toreceive the rope. which passes over it. At the center of the pulley orwheel, and concentric with its periphery7 there is made a circularopening, a, and the inner periphery ot' the pulley or wheel around thisopening a, is grooved or made of concave form, it being' a seinicirclein its transverse section, as shown clearly at b in Fig. 2. In thisgroove b there are placed a series of metal balls, C, ot' such adiameter that they will t snugly in the groove b, and still be allowedto rotate treel y in it.

D is the axis of wheel which passes through the cheeks c c of the blockand through the space at the center of the circle formed by the balls,as shown clearly in Fig. 1. The halls C rest or bear on the axis D, .thelatter being stationary. The axis is provided with a shoulder, d, whichbears against the inner parts of the balls at one side and prevents theaxis moving longitudinally in one direction, a key or head preventingthe movement of the axis in the opposite direction. By this arrangementit will he seen that when the pulley or wheel B is rotated the balls U,which are interposed between the axis D and the pulley or wheel, serveas anti-ii-iction bearings. The balls O cannot become casuallydisplaced, nor are there any parts liable to get out of repair. When awooden pulley or wheel is used, a piece ot' metal is inserted centrallyin it, provided with a circular opening, a, and a groove, b, to receivethe balls O.

I do not claim, broadly, the use of balls as an anti-friction medium;but,

Havingthus described myinvention, I claim as new and desire to secure byLetters Patent as an improved article of manufacture- A pulley-blockmade with its wheel B grooved centrally, and provided with balls C, allas herein shown and described.

Witnesses: JOSEPH M. DRAKE.

R. GAWLEY, TIMOTHY SHINE.

